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PRELIM ENVI ENG:
SANITARY LANDFILLS
| Question | Answer |
|---|---|
| A waste disposal site designed, constructed, operated and maintained in a manner that exerts engineering control over significant potential environmental impacts arising from the development and operation of the facility. | Sanitary Landfill |
| A land disposal site using engineered methods to minimize environmental hazards by spreading waste in minimal volume and applying/compacting cover material daily. | Sanitary Landfill |
| is the term used to describe the process by which solid waste and solid waste residuals are placed in a landfill (George Tchobanoglous | Landfilling |
| In the past, the term ________________ was used to denote a landfill in which the waste placed in the landfill was covered at the end of each day’s operation | sanitary landfill |
| refers to an engineered facility for the disposal of MSW designed and operated to minimize public health and environmental impacts. | sanitary landfill |
| Landfills for individual waste constituents such as combustion ash, asbestos, and other similar wastes are known as ______ | monofills |
| andfills for the disposal of hazardous wastes are called ___________ | secure landfills. |
| Those places where waste is dumped on or into the ground in no organized manner are called uncontrolled land disposal sites or _______ | waste dumps. |
| The term ___ is used to describe the volume of material placed in a landfill during one operating period, usually 1 day. | cell |
| includes the solid waste deposited and the daily cover material surrounding it. | cell |
| __________ usually consists of 6 to 12 in of native soil or alternative materials such as compost, foundry sand, or auto shredder fluff that are applied to the working faces of the landfill at the end of each operating period | Daily cover |
| is a complete layer of cells over the active area of the landfill. Typically, landfills comprise a series of lifts | lift |
| A ___________is typically used where the height of the landfill will exceed 50 to 75 ft. | bench (or terrace) |
| __________ are used to maintain the slope stability of the landfill, for the placement of surface water drainage channels, and for the location of landfill gas recovery piping | Benches |
| The _________ includes the landfill cover layer. | final lift |
| are materials (both natural and man-made) that are used to line the bottom area and below-grade sides of a landfill. | Landfill liners |
| The liquid that forms at the bottom of a landfill is known as _______. In general, leachate is a result of the percolation of precipitation, uncontrolled runoff, and irrigation water into the landfil | leachate |
| will also include water initially contained in the waste. | leachate |
| is the term applied to the mixture of gases found within a landfill. | Landfill gas |
| is the term used to describe the steps that must be taken to close and secure a landfill site once the filling operation has been completed | landfill closure |
| refers to the activities associated with the long-term maintenance of the completed landfill (typically 30 to 50 years). | postclosure care |
| refers to those actions necessary to stop and clean up unplanned contaminant releases to the environment. | remediation |
| 1. Safeguard human health & welfare 2. Protect water resources 3. Maintain natural resources integrity | objectives of sanitary landfills |
| 1. Leachate collection and treatment 2. Controlled drainage 3. Minimization of gas generation 4. Minimization of windblown wastes | Primary means to achieve these objectives: |
| ____________ are uncontrolled, unfenced, with no barriers, allowing windblown waste, scavenging, and poor management. _______ are controlled, fenced, with leachate & gas management, waste compaction, and trained staff. | Open dumpsites ; Sanitary landfills |
| There are two basic methods of landfill operation, ________ and __________ | area fill and trench fill |
| Both methods operate on the principle of a "cell,“ which in landfills comprises the compacted waste and soil covering for each day | area fill and trench fill |
| Solid waste is deposited on the surface, compacted, then covered with a layer of compacted soil at the end of a working day. | Area Method |
| ▪ Ramp / Progressive slope method. ▪ This method is seldom restricted by topography: flat or rolling terrain, canyons, and other types of depressions are all acceptable. | Area Method |
| Advantages: No trench excavation needed. Works on terrain unsuitable for trenches. Disadvantages: Cover material may need to be imported. More litter problems possible. Higher area-to-volume ratio → higher costs. | Area Method |
| is excavated and the solid waste is placed in it and compacted; and the soil that was taken from the trench is then laid on the waste and compacted | Trench Method |
| ▪ This method is used on level or gently sloping land where the water table is low. ▪ The advantage of this method is that the soil taken from the trench can readily be used as cover. | Trench Method |
| Advantages: Usually no imported cover needed, minimal working face, good drainage. Disadvantages: Not for high excavation/shallow groundwater areas, harder leachate collection, some volume loss between trenches. | Trench Method |
| a final disposal facility applied to LGUs with net residual waste generated of less than or equal to 15 tons per day (TPD). It shall also apply to a cluster of LGUs with a collective disposable residual waste of less than or equal to 15 TPD. | Category 1 |
| For LGUs generating 15–75 TPD of residual waste, or clusters of LGUs with collective waste in the same range. | Category 2 |
| For LGUs generating 75–200 TPD of residual waste, or clusters of LGUs with collective waste in the same range. | Category 3 |
| a final disposal facility applied to LGUs with net residual waste generated of greater than 200 TPD. It shall also apply to a cluster of LGUs with a collective disposable residual waste greater than 200 TPD | Category 4 |
| The closure standards for sanitary landfills require owner/operators to install a final cover system to minimize infiltration of liquids and soil erosion | Final Cover Systems |
| he permeability of the final cover must be less than the underlying liner system, but no greater than 1.0 x10-5 cm/sec. | Final Cover Systems |
| The reason for this requirement is to prevent the “bathtub effect” where liquids infiltrate through the overlying cover system but are contained by a more permeable underlying liner system. | Final Cover Systems |
| This causes the landfill to fill up with water (like a bathtub), increasing the hydraulic head on the liner system that can lead to the contaminated liquid (leachate) escaping and contaminating groundwater supplies. | Final Cover Systems |
| must consist of an infiltration layer of at least 18 inches of earthen material covered by an erosion layer of at least 6 inches of earthen material that is capable of sustaining native plant growth. | Final Cover Systems |
| his mulch is the alternate daily landfill cover made from recycled post consumer paper and wood, polymers, enzyme complex, biological stimulants, and other proprietary ingredients | Alternate Daily Cover |
| The _____________ requirements for sanitary landfills establish the minimum requirements with which owner/operators must comply once the landfill stops receiving waste and begins closure. | closure and post-closure care |
| Maintain the integrity of the landfill by ensuring proper function of: Final cover system Leachate collection system Groundwater monitoring system Methane gas monitoring system | post-closure care |
| Must include: Monitoring & maintenance activities and their frequency. Contact info of responsible person. Planned land use during post-closure period. | post-closure care |
| With open space shrinking and environmental awareness, expanding, many communities wanted to reclaim and make productive use of older landfill sites | Reclamation and Reuse |
Created by:
rezzie